This is a Google map of the Catholic Parishes on the Camino. this link was posted by another pilgrim on the American Pilgrims on the Camino Facebook page. If you highlight each parish with your mouse and click on it, it gives you a popup of the information about the specific parish including mass times. It is all in Spanish but not too difficult to understand Parroquias de los Caminos Buen Camino!

The link below takes you to an elevation map of the Via de la Plata. While there are definitely areas where there are climbs it seems that until you turn towards Santiago on either the Camino Sanabres after Zamora or The Camino Frances after Astorga.